It is completely free from cost and has a full array of useful features.
它是完全免费的，从成本，并充分阵列的实用功能。
After using, we may free the array and save some memory.
处理完后立即释放，可以节省内存。
The caller is thus free to modify the returned array.
调用者因此可以对返回数组进行修改。
The caller is thus free to modify the returned array.
调用者因此可以对返回数组进行修改。
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